Defer clearing textures and renderbuffers

gpu/command_buffer/service/renderbuffer_manager.cc

Index: gpu/command_buffer/service/renderbuffer_manager.cc
diff --git a/gpu/command_buffer/service/renderbuffer_manager.cc b/gpu/command_buffer/service/renderbuffer_manager.cc
index a12d66e1f4e09088a1c996d841d43d0c1ddb5344..5c9ca304e94afd82bb83c7976570f786b5c1d33f 100644
--- a/gpu/command_buffer/service/renderbuffer_manager.cc
+++ b/gpu/command_buffer/service/renderbuffer_manager.cc
@@ -13,7 +13,8 @@ namespace gles2 {
 RenderbufferManager::RenderbufferManager(
     GLint max_renderbuffer_size, GLint max_samples)
     : max_renderbuffer_size_(max_renderbuffer_size),
-      max_samples_(max_samples) {
+      max_samples_(max_samples),
+      num_uncleared_renderbuffers_(0)  {
 }
 
 RenderbufferManager::~RenderbufferManager() {
@@ -34,14 +35,39 @@ void RenderbufferManager::Destroy(bool have_context) {
   }
 }
 
+void RenderbufferManager::SetInfo(
+  RenderbufferInfo* renderbuffer,
+  GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height) {
+  DCHECK(renderbuffer);
+  if (!renderbuffer->cleared()) {
+    --num_uncleared_renderbuffers_;
+  }
+  renderbuffer->SetInfo(samples, internalformat, width, height);
+  if (!renderbuffer->cleared()) {
+    ++num_uncleared_renderbuffers_;
+  }
+}
+
+void RenderbufferManager::SetCleared(RenderbufferInfo* renderbuffer) {
+  DCHECK(renderbuffer);
+  if (!renderbuffer->cleared()) {
+    --num_uncleared_renderbuffers_;
+  }
+  renderbuffer->set_cleared();
+  if (!renderbuffer->cleared()) {
+    ++num_uncleared_renderbuffers_;
+  }
+}
+
 void RenderbufferManager::CreateRenderbufferInfo(
     GLuint client_id, GLuint service_id) {
+  RenderbufferInfo::Ref info(new RenderbufferInfo(service_id));
   std::pair<RenderbufferInfoMap::iterator, bool> result =
-      renderbuffer_infos_.insert(
-          std::make_pair(
-              client_id,
-              RenderbufferInfo::Ref(new RenderbufferInfo(service_id))));
+      renderbuffer_infos_.insert(std::make_pair(client_id, info));
   DCHECK(result.second);
+  if (!info->cleared()) {
+    ++num_uncleared_renderbuffers_;
+  }
 }
 
 RenderbufferManager::RenderbufferInfo* RenderbufferManager::GetRenderbufferInfo(
@@ -53,7 +79,11 @@ RenderbufferManager::RenderbufferInfo* RenderbufferManager::GetRenderbufferInfo(
 void RenderbufferManager::RemoveRenderbufferInfo(GLuint client_id) {
   RenderbufferInfoMap::iterator it = renderbuffer_infos_.find(client_id);
   if (it != renderbuffer_infos_.end()) {
-    it->second->MarkAsDeleted();
+    RenderbufferInfo* info = it->second;
+    if (!info->cleared()) {
+      --num_uncleared_renderbuffers_;
+    }
+    info->MarkAsDeleted();
     renderbuffer_infos_.erase(it);
   }
 }